Puerto de Altotero

Overview

Puerto de Altotero is a Category 2 climb that packs a genuine punch into a compact 7.2 km. From a start elevation of 633 m it lifts you to a summit of 1094 m — a net gain of 461 m at an average gradient of 6.43%. That average alone marks it as a serious effort, but the number that will linger in your legs is the maximum: a ramp of 12.3% that nearly doubles the mean. This is a climb that rewards riders who can hold a steady tempo and then dig deep when the road tips up. It is long enough to matter and steep enough to hurt, sitting squarely in the range where a Cat 2 earns its label.

How the Gradient Unfolds

The shape of Altotero is defined by the gap between its 6.43% average and its 12.3% maximum. A climb that averages 6.43% but spikes to 12.3% is not a metronome — it breathes. Expect stretches close to or slightly below the average that let you settle into rhythm, punctuated by pitches that climb toward and hit that 12.3% wall. Over 7.2 km you gain 461 m net, so the elevation stacks up relentlessly with few, if any, true recovery flats. Interestingly, the total ascent of 440 m sits just under the 461 m net gain, which tells you the road climbs almost continuously in one direction — there is little descending inside the effort to give the legs a break. Treat every softer section as a chance to bank energy before the next ramp.

Pacing Notes

The key to Altotero is pacing to the average, not the peaks. At a 6.43% average over 7.2 km, this is a sustained threshold effort, so anchor your intensity to your FTP and hold something in reserve for the 12.3% pitch. Aim to ride the shallower sections just below threshold, then allow a controlled surge above it when the gradient bites — but never so hard that you blow apart before the 1094 m summit. If you are unsure of your threshold power, run the numbers through the FTP estimator before your ascent so your pacing plan is grounded in real data rather than guesswork. Riders who go out too hard on the lower slopes will find the steepest ramp unforgiving.

Gearing

Given the 6.43% average and the 12.3% maximum, gearing is where you win or lose this climb. A compact 34-tooth inner chainring is the sensible foundation. Pair it with at least a 32-tooth cassette sprocket — a 34×32 — if you are a strong climber comfortable grinding through steep pitches. For most riders, and especially anyone tackling the 12.3% ramp on tired legs after 7.2 km of climbing, a 34×34 gives you the extra range to keep your cadence up and your knees happy. The lower gear is cheap insurance against being over-geared at the summit.

Summary

Puerto de Altotero is a Cat 2 climb that earns its category through sustained gradient and one savage maximum pitch. Pace to the 6.43% average, gear for the 12.3% spike, and the 1094 m summit is yours.

Length: 7.2 km
Average gradient: 6.43%
Max gradient: 12.3%
Start: 633 m
Summit: 1094 m
Net gain: 461 m
Total ascent: 440 m
Category: 2